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�= k <br /> Indigo Trisulfonate Method (Bader and Hoigne, 1982) MTBE and ozonation <br /> riel <br /> products were identified using a Hewlett Packard gas chromatograph (Mo <br /> 6890) and mass spectrometer (Model 5973). A laboratory gas chromatograph <br /> (HNU Model 320 with capillary column) was used for quick inspection of MTBE <br /> removal during testing <br /> Results. Figure 2 represents the results obtained under laboratory conditions (gas <br /> flow = 6.0 Llhr). MTBE is rapidly degraded by microbubble ozone ink cO o <br /> The results are presented as ozone residual in the aqueous phase, compared <br /> mP <br /> ozone dosage, to enable comparison with previous literature results- TherateIn decay is similar to that previously reported by Karpel vel Leitner, et al. (1 ) n <br /> the bench-scale testing, ozone microbubbles appeared effective in reducing <br /> MTBE concentrations to beyond 90% of original levels. The rate of removal was <br /> sensitive to ozone concentration, pressure, and iron silicate content. <br /> lu,\ <br /> •`UA °$ <br /> 0 • <br /> o \ <br /> cU`a 04 � <br /> 02 _ <br /> 0A <br /> 2 4 10 1= 14 <br /> 0 s s <br /> APPLIED OZONE (mmoUL) <br /> FIGURE 2. MTBE removal with exposure to microbubble ozone during <br /> bench-scale semi-batch testing. <br /> FIELD TESTING <br /> Field testing for MTBE removal in groundwater was performedat 'O <br /> different sites: (1) a source region of a gasoline spill at an automotive service <br /> station, with aromatic (BTEX) contaminated soil andground water, and (2) at the <br /> forefront of a solely MTBE plume upgradient of a water supply Well. Leading <br /> portions of gasoline spill plumes often have MTBE separating from other fuel <br /> constituents because it is very soluble and tes where aromatic ds u�fractions Have t <br /> o soils. The <br /> rate of removal could be compared with other <br /> been treated(Kerfoot, 1998) <br /> S <br />